Pigment composition

Abstract

There is provided a new pigment composition composed of a pigment and a dispersant wherein the dispersant is a phosphoric ester compound represented by the formula below. ##STR1## (where one or more than one of the three R's are hydroxyl-terminated polyester residues obtained by self-polycondensation of a hydroxy-carboxylic acid; and one or two of the three R's, in case of being remained, are hydrogen atoms, cations, or residues of an alcohol excluding the above-mentioned polyesters.)

What is claimed is: 
     
       1. A pigment composition composed of a pigment and a dispersant characterized in that the dispersant is a phosphoric ester compound represented by the formula ##STR3## where at least one R is a polyester residue derived from a hydroxy-terminated polyester obtained by self-polycondensation of a hydroxy-carboxylic acid, and any remaining R is a hydrogen atom, a cation, or a residue of an alcohol. 
     
     
       2. A pigment composition as set forth in claim 1, which further comprises a solvent and resin binder. 
     
     
       3. A pigment composition as set forth in claim 1, wherein one R is the polyester residue derived from the hydroxy-terminated polyester obtained from a hydroxy-carboxylic acid. 
     
     
       4. A pigment composition as set forth in claim 1, wherein two of the R's are the polyester residues derived from the hydroxy-terminated polyester obtained from a hydroxy-carboxylic acid. 
     
     
       5. A pigment composition as set forth in claim 1, wherein each R is the polyester residue derived from the hydroxy-terminated polyester obtained from a hydroxy-carboxylic acid. 
     
     
       6. A pigment composition as set forth in claim 1, wherein the hydroxy-termianted polyester is a polyester obtained from at least one of hydroxy-carboxylic acid selected from the group consisting of ricinolic acid, hydroxystearic acid, castor oil fatty acid, hydrogenated castor oil fatty acid, hydroxyvaleric acid, hydroxycaproic acid, hydroxy-ethyloxybenzoic acid, and hydroxynaphthalene-carboxylic acid.